The webapp provides for each item the link on ECB's website.
Speeches for : Vitor Constancio where "constraints" appeared
2017-09-25 : Developing models for policy analysis in central banks2017-08-23 : Investment and growth in advanced economies: selected takeaways from the ECB’s Sintra Forum
2016-12-16 : Stijn van Nieuwerburgh's contribution to macroeconomics and finance
2015-08-25 : Assessing the new phase of unconventional monetary policy at the ECB